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Hypertrophic cardiomyopathy (HCM) is the most common genetic disease of the myocardium and bares the risk of progression to heart failure or sudden cardiac death. Identifying patients at risk remains an unmet need. Recognizing the dependence of microscopic susceptibility on tissue microstructure and on cardiac macromorphology we hypothesized that myocardial T 2  *  might be altered in HCM patients compared to healthy controls. To test this hypothesis, myocardial T 2  * -mapping was conducted at 7.0 Tesla to enhance T 2  * -contrast. 2D CINE T 2  * -mapping was performed in healthy controls and HCM patients. To ensure that T 2  *  is not dominated by macroscopic magnetic field inhomogeneities, volume selective B 0  shimming was applied. T 2  *  changes in the interventricular septum across the cardiac cycle were analyzed together with left ventricular radius and ventricular septal wall thickness. The results show that myocardial T 2  *  is elevated throughout the cardiac cycle in HCM patients compared to healthy controls. A mean septal T 2  *  = 13.7 ± 1.1 ms (end-systole: T 2  *  ,systole  = 15.0 ± 2.1, end-diastole: T 2  *  ,diastole  = 13.4 ± 1.3 ms, T 2  *  ,systole /T 2  *  ,diastole  ratio = 1.12) was observed in healthy controls. For HCM patients a mean septal T 2  *  = 17.4 ± 1.4 ms (end-systole: T 2  *  ,systole  = 17.7 ± 1.2 ms, end-diastole: T 2  *  ,diastole  = 16.2 ± 2.5 ms, T 2  *  ,systole /T 2  *  ,diastole  ratio = 1.09) was found. Our preliminary results provide encouragement that assessment of T 2  *  and its changes across the cardiac cycle may benefit myocardial tissue characterization in HCM.

Myocardial Effective Transverse Relaxation Time T 2 * is Elevated in Hypertrophic Cardiomyopathy: A 7.0 T Magnetic Resonance Imaging Study